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// RUN: %dafny /compile:0 /print:"%t.print" /dprint:"%t.dprint" "%s" > "%t"
// RUN: %diff "%s.expect" "%t"
trait P1
{
method N0() {
var a: array<int>;
if (a != null && 5 < a.Length) {
a[5] := 12; // error: violates modifies clause
}
}
method Mul(x: int, y: int) returns (r: int)
requires 0 <= x && 0 <= y;
ensures r == x*y;
decreases x;
}
class C1 extends P1
{
method Mul(x: int, y: int) returns (r: int)
requires 0 <= x && 0 <= y;
ensures r == x*y;
decreases x;
{
if (x == 0) {
r := 0;
} else {
var m := Mul(x-1, y);
r := m + y;
}
}
method Testing(arr:array<int>)
requires arr != null && arr.Length == 2 && arr[0]== 1 && arr[1] == 10;
{
N0(); //calling parent trait methods
var x := 2;
var y := 5;
var z := Mul(x,y);
assert (z == 10);
}
}
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